vedder



' April 16, 1 92 9.

B. F. P.-VEDDER ELECTRIC RADIATOR Filed March 5, 1927 2 snetsfsneet l 2 Sheets-Sheet .2

` April 16, 1929. B. F. P. VEDDER ELECTRIC RADIATOR Filed March 5, 1 .927

.- to of a casing in anv aperture provided therefor.

- .Patented Apr. '16,. 1929A.,A

fsf-raras tresses Parser orrice.

l BERNHARDT n.1. VEDDER, or MiLWAuKEn, wrscoiisrir. i'

niincrnio ist/ai)IA'roR.V l

' Application led March" 5,

This invention lrelatesto electric radiators.

Objects of this inventionare to provide arnovelV orino `electric heater adapted to heat the air iii a roomv in the manner of a radiator. andfto. lprovide -a devicel which isl of eminently` practical and simple 'construeLA tion. L 1 .f i i Further* objects of. this .invention are vto provide airelectricheater in whichr theairis not heated toan excessive temperature, but

inv which a largevolurneoi' air is heated to .aV

moderate temperature, so that the air does not-*have theburnt Vsmell which is `seobjec- `tional with thefusual Atypes of heaters.V

vFurther-objects are to v provide a novel form` of heater iiiwhich relatively largeV radiating surfaces are provided against which` the `rapidly, travellingxstream of-` air' contacts ,and to so constructtheradiating members that they serve'to cool'thel conductorsleading to the heating element and thus burning oiitheconductorsis wholly avoided.y 'Further objects are vto. provide an electr-ic heater in rwhich simple types-'of standardv steelt; parts may'i be used lto construct the heateror its rinajorpart,-and in which Vrelatively simple stampingsare employed .for

thecasings. 1; l I

Anembodymeiitgof the linvention-is shown in the accompanying. drawings inl which?,- .Y yFigure l, is 4a side elevation partly.. in section to show the successive layers'or parts of lthe `device suchy vview',,corresponding to i v alongitudinal section?` t y' Figure is.v i a transverse y A l lsectional view orithe,line/2+ Zot Figure l; vFigure" 3` isfja VIplanjview of the device;1 4Figure 4: Aisa sectional' view; on the line Referringto the drawings, it will be. seen that the heaterfcomprises amica or similar memberfpl upon which thelheating wire or:

member 2 is positioned preerably'by wind- "ingit' kspirally in notches; This inembe is some high heat resisting metal'of-non-oxidizing characteristics,"such, for eXampley as`r nickel `chromiuinfcompound. v-Thiscon-l ductor has; onecle: its vends connected toene of the terminalprongs 3 carried by an insuf lating two-part plate 4lbolted to .the front The'other 4terminal,goesjto a multipoint switch/5 controlled lvby. a vsuitable lrnob 6. y The intermediate points of the resistance 4element 2 ai'jecoiinectedto-the switch by.

l the utmost'iiacility.,

1927. Serial No. 173,099.

iii-cans otconductois 7 which extend downwardly and then outwardly to the'switch, as shown in Figure l. .The switch is adapted to connect v.any one or` the pointson the resistaiicefto the other terminal'lprong',8. lt is to be noted that'this mica member is" f substantiallyjUfshape, as may .be seen from .Figurel7 to facilitate the winding `of the resistance element thereon in the-notches 9 V'providedin the edges of the mica member l.'

Further, the innerterminals ofthe Yconductors frare Veng'gagedfwith the resistance eleinentby means of clips 10` provided with a plurality oiijarms-ll passingrthrough jthe mica and clamped to the resistance element, as shown'in Figure l. rlhis provides very secure inode o'lI attachment for-the fparts."

The extreme endsfot the resistance element Y' andthe parts are clamped together by theV `clamping nuts'l located on oppositesides of the plates '14. The bolts; extend outwardly. and are provided With spacers 17 on'opposite sides ofthelieating uniti` T he heating Vunit",v itzwillbe seen, is anlentiretyV and ma-ylbei readily handled in the yass'eiiibling yof the device,` and positioned withinfthe casing'with 'It is t to vbe particularly notedthat the' `metal plates or radiators 14, areprovided with two rectangular' apertures 18. at' spaced points throughy .itsy central portion.V These rectangular apertures are provided with* beveled aces'lQ for a purpose hereinafter to,

appear. Y 4 f v.

'The casing members are'substantial du# plicates and areindicate'd by the' reference character'QO. One of thei'nen'ibers is-provided` with a downwardly depressed'lipvl which itsbeneatli the inner marginal edge; of the other casing member.- vThis constructionis fiollowed' throughoutftlie sides and top portion oi' the ycasing to Vthus pro- 1 vide a Ytwo-part housing for the heating'unit. At regular intervals; preferably immediately adjacentthe openings 18, insf22 arestruclr inwardlyffroin the body of tliecasingfto provide -entrance apertures 23 for air. Further, the air can enter through the bottom of the casing, as indicated by the arrows in Figure fi. riChe pins 22 direct the air inwardly and upwardly and cause it to sweep into and past "the openings 18 Aand also to impinge against the sides of the heating unit. Thus, the heating unit vvis -cc'oled by the air and impartsiits heat thereto. Further, the plates 14 adjacent the openings 18 is materially cooled and, consequently, thegconductors 7 (see "Figure l) which parallel one of these openingslS, ,are prevented from becoming excessively hot and all'danger 'of the burning out of these conductors is, 'consequently avoided.

The casing members are held in -place by means of outer nuts 24k screwed on 1the bolts l5. Thus, a very rigid structure is vprovided anduoneA in which the bolts serve not only the purpose oit' holding` the heating unit elements in place, but jalso serve `to hold the heating unit in its relative vposition to, the casing andthe casing parts in their 4assembled position. l

The upper portion of theuca'sin'g is provided with a Aplurality of outlet openings 25 through which the air ina-y freely pass.

The 'lowerfportion of each half of the casing is provided with downwardly and outwardly extending legs 26A which preferably have 'beaded lower ends 27 to provide a finished end therefor. is ypreferablefto bolt porcelain or other heat insulating feet 28 to 'the ldwer ends of these legs 26, as shown particularly in Figuresv l andet. i

The "entire heater can be readily carried by 'means of a handle 29 having outwardly turned trunn'ions or hinged parts 3Q. This handle may lie flat upon -the top of the cas-` ing or extend upwardly therefrom into the position shown in Figure l, if desired. It is to ,be noted particularly from Figure f2, thatptheftrunnion portions 30 of the handle project through upturned clips V3l struck upwardly from the portion 2l of one of the casing members.. y These upturncd clips pass throughapertures formed in the other casing member, as shown in Figure 2, and thus serve to lock the top ofthe casing members together in addition to the secureniannerin which the bolts l5 hold such members.

lit will thus be seen than an electric air heater has been provided 'which heats the air by a direct contact of the flowing .stream of air against relatively massive radiating members and,` it will be seen further, that these radiating members provide an entensive suriace in contact with the air and, consequently, do not yheat the air to a point at which it will have a burnt smell, ordinarily occasioned by electric heaters. Furtheimtwwill beJ seen that this heater is a convenient type ot heater'and may beused In addition to this, 'it

as an ordinary radiator in a room, such heater being placed upon the floor and thus heating the coolest air and causing -a continuous circulation oi' air in the room.

It" desired, a shield plate may be placed on the bottom oi' the heater to guard the iioor against direct radiation from the heating 'unit This plate, however, has not been shown, as it is not ordinarily necessary to use such plate.

Although the invention fhas been "described in considerable detail, such description is intended as illustrative. ratherl than limiting as the invention may be variously enil'iodi'ed and as the scope of such invention is to be determined as claimed.

I claim:

l. Ari-electric heater comprising a helatingV unit vhavii'ig a centrally located heating element, means ior ,attachment-to a source ot electric energy, insulating sheet-s on iopposite sides of said heating element, a pair of relatively thick metal plates clamped `tightly on opposite sides of said heatingelement and acting as heating surfaces for the air, a sheet metal casing positioned around said heating unit and in spaced relation thereto, 'bolts passino1 through said heating unit, clamping nuts ior binding the Vparts oi' said heating unit together, said bolts extending outwardly, and means attaching said bolts to said casing yto hold said heating unit freely suspended and spaced from said casing.

2. An electric heater Acomprising a heating unit having a centrally located heating element, means for attachment 'to a soi'irce of electric energy, insulating sheets on opposite sides of said heating element, a pair of relatively thick metal plates `clamped tightly 'on opposite sides oit said heating element and acting as heating surfaces for the air, asheet metal casing positioned around said heating unit and vin spaced relation thereto, tbolts passing through said heating unit, clamping nuts Vfor binding thefpartsfof said `lieating unit together, said jbolts extending outwardly, and means attaching said bolts to said casing to 'hold 'said 'heating unit freely suspended and spaced from said casing, said casing having inwardly turned i'is 'for vdirecting the air against the heating faces and having an opening immediately adjacent each fin.

3. An electrid heater `comprising 'aheatf l'lO jecting air into contact with said plates adjacent said openings, whereby the plates adjacent said openings are prevented from excessive heating and thereby protect said conductors against excessive temperatures.

' et. A heatingunit for anelectric airheater 'consisting of a .pair of metal plates, means for forcing said plates towardsV each other,

I Y insulating sheets positioned on opposed faces. of' said plates, a heating element Wound ',5.'An electric heater for heating air coinprising a heating element having spaced members, a pair of'plates positioned on opposite sides of said element, electrical insulation interposed between said \--1n`etal platesV and said element, a plurality7 of bolts' passingl through said plates kand having nuts thereon v binding said plates tightly against said electrical insulation to .secure good heat conduction, said plates having apertures opening completely through from one plate to the other plate to provide air passages, conductors extending vfrom said heating elements and located adjacent said `air, passages,

whereby said conductors are at a lower temperature than said heating element, said bolts projecting outwardly from opposite sides of said plates, and a casing having side walls to ,which the ends of=said bolts are secured, ywhereby said plates and the tightly gripped, enclosed heating elementv are 'freely suspended in vair and spaced from said casing.

In testimony that Il claim the foregoing I have hereunto set my 'hand at Milwaukee,

in the county of Milwaukee and vState of i Y v 40 Wisconsin;

' BERNHARDT F. P. VEDDER. i' 

